. Brain and body of fish; a study of brain pattern in relation to hunting and feeding in fish. Fishes -- Anatomy; Nervous system -- Fishes; Brain. 54 BRAIN AND BODY OF FISH tympanic membrane, as found in the liigher vertebrates ; this allows the incompressible fluid in the cavity to vibrate. It must be understood that the membranous wall of the saccule lies in the central cavity of the bony labyrinth of the ear, known as the vesti- bule ; in the herring an appendix of the vestibule meets the anterior spherical air vesicle, which we shall shortly describe, and comes in close contact with it. Th
. Brain and body of fish; a study of brain pattern in relation to hunting and feeding in fish. Fishes -- Anatomy; Nervous system -- Fishes; Brain. 54 BRAIN AND BODY OF FISH tympanic membrane, as found in the liigher vertebrates ; this allows the incompressible fluid in the cavity to vibrate. It must be understood that the membranous wall of the saccule lies in the central cavity of the bony labyrinth of the ear, known as the vesti- bule ; in the herring an appendix of the vestibule meets the anterior spherical air vesicle, which we shall shortly describe, and comes in close contact with it. The long silvery looking tube that we see in the upper part of the abdomen of a fresh herring is the swim-bladder. Hillier gives a very concise description of this organ as follows : "It is a simple long sac, opening posteriorly by a fine canal through a dense sphincter muscle, and anteriorly opening through. Fig. v.—a dissection of the lateral wall of the Herring (enlarged) from within to show the accessory auditory apparatus. The front wall of the anterior spherical air-vesicle has been chipped away so that india-ink could be injected into the posterior air-vesicle through the canal leading into the pear-shaped vesicle. The ink has also passed into the canal leading into the swim-bladder. Below the pear-shaped vesicle is the outer wall of the saccule closed by the auditory fenestra. a cartilaginous arch, into the fine duct that leads into the interior of the labyrinth. A canal from the stomach, the pneumatic duct, enters the swim-bladder about its middle. So that the swim- bladder is unique among fishes in having three openings into its cavity. It is curious to note that the communication from the stomach is actually in line with the pharynx, and that the passage to the lab3T:'inth is through a ring of cartilage ; for in this respect it suggests the similar condition of things in mammals, with the Eustachian tube running from the naso-pharynx to the cavity of the middle
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